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Thesis (M.S.)—University of Nebraska—Lincoln, 1961. Department of Engineering Mechanics.


Copyright 1961, the author. Used by permission.


A centrifugal pendulum absorber for the reduction of linear vibrations was proposed by F.E. Reed in 1949. This is an analysis of a centrifugal absorber in which the rotating masses are supported by elastic restoring members.

Equations for the amplitudes of vibration of the absorber and of the excited mass, and the frequency equation have been expressed in dimensionless quantities to make the results more easily applicable to any physical situation.

The number of resonant frequencies of the system is show to be a function of the ratio W2/W1 – the rotational frequency of the absorber to the exciting frequency. If this ratio is sufficiently large, there is only one resonant frequency and it is less than the resonant frequency of the vibrating body considered as an isolated system. If the resonant frequency of the system is less than the exciting frequency, partial absorption will occur.

A nomograph of the frequency equation has been developed and included as an aid in choosing parameters to set the resonant frequency of the system at any desired level.

Advisor: Gerald M. Smith